TOPEX BYTTON HSDPA
User’s Manual
pag. 43
For the first two values, the field “MSS Value” is inactive.
Clamping means MSS = MTU – 40 (MSS is only the size of TCP data that doesn’t include the 20 byte
TCP header and the 20 byte IP header).
Thus for the Ethernet link the MSS value would be 1460, since MTU is 1500.
If you selected “Set MSS”, the field below it, “MSS Value”,
becomes active, it is no longer gray, now you can enter here
the value for MSS.
Notice that Topex BYTTON HDSPA features
two
GRE IP tunnels, GRE0 and GRE1.
5.4 ROUTING
The section about “ROUTING” includes thee sub-sections:
-
Firewall (both packet filtering and port or address redirection)
-
Routes (display and configure the static routes)
-
Dynamic (selects OSPF or RIP for dynamic routing).
5.4.1. Firewall
BYTTON HSDPA comes with a default firewall configuration, which ensures the security of your local
network.
The “Firewall” section includes both NAT (redirecting addresses), port forwarding (PAT) and Firewall
(accepts or rejects data packets). Thus the BYTTON Firewall configuration page features two sections:
upper pane “Port Forward” and lower pane “Iptables Rules” and two clickable links, “Advanced Iptables”
and respectively “View Active Rules”, which will open additional sections.
